This standard specifies product varieties, technical requirements, test methods and inspection rules for mining electric drill cables with rated voltage 0.3/0.5kV. This standard applies to rated voltage 0.3/0.5kV mining copper core rubber insulated rubber sheathed electric drill cables. This standard should be used together with GB 12972.1. GB 12972.8-1991 Mining rubber sheathed flexible cables Part 8: Mining electric drill cables with rated voltage 0.3/0.5 kv GB12972.8-1991 Standard download and decompression password: www.bzxz.net
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National Standard of the People's Republic of China Mining Rubber Sheathed Flexible Cables Part 8: Rated Voltage 0.3/0.5kV Mining Electric Drill Cables Flexiblerubber-sheathed cablesforminingpurposesPart 8 :Flexibledrill cables forratedvoltageof0.3/0.5kV 1 Subject content and scope of application GB12972.8-91 Replaces GB1170--74 This standard specifies the rated Product varieties, technical requirements, test methods and inspection rules for mining electric drill cables with voltage of 0.3/0.5kV. This standard applies to rated voltage 0.3/0.5kV mining copper core rubber insulated rubber sheathed electric drill cables. This standard should be used together with GB12972.1. 2Usage characteristics 2.1 Rated voltage U/U is 0.3/0.5kV. 2.2 The long-term allowable operating temperature of the cable conductor is 65°C. 2.3 The minimum bending radius of the cable is 6 times the cable diameter. 3 model 3.1 cable model is shown in Table 1. Type No. UZ-0.3/0.5 UZP-0.3/0.5 3.2 Name Mine The electric drill cable is called mine shielded electric drill cable The cable type is shown in Figure 1. State Bureau of Technical Supervision 1991-06-06 Approved Table 1 Use Purpose Power connection for electric drills with rated voltage 0.3/0.5kV and below in coal mines 1992- 03-01Implementation Specifications 4 UZ-0.3/0.5 GB 12972.8—91 UZP-0.3/0.5 Figure 1 1 - Power core conductor; 2 - Power core insulation; 3 - Semiconducting shielding layer; 4 - Filling core; 5 - Ground core conductor: 6 - Ground core cladding; 7 1. Sheath; 8. Control core conductor; 9. Control core insulated cable specifications should comply with Table 2. Number of cores × nominal conductor cross-section, mm2 Power wire core 3×2.5 3×4 3×2.5||tt| |3×4 Ground core 1×2.5 1×4 1×2.5 1×4 5 Technical requirements Control wire core 1×2.5 1×4 Conductor structure Number/single wire Nominal diameter 77/0.20 126/0.20 77/0.20 126/0.20 GB12972.8—91 Table 2| |tt||power core protection insulation edge nominal thickness 1.0 1.0 The technical requirements of 1.0 1.0 5.1 cable shall comply with Table 3 and Table 4. 5.2 Conductor 5.2.1 The single wire in the conductor should be tinned, and the surface of the conductor can be covered with an isolation layer. Note: Discoloration or brittleness of the isolation layer after vulcanization will not be assessed. 5.3 Insulation Sleeve Nominal thickness 3.5 3.5 3.5 3.5 Cable outer diameter|| tt||UZ-0.3/0.5 minimum value 17.8 19.1 19.1 20.5 5.3.1 power core The insulation of the control wire core should comply with the XJ-00A regulations in GB7594.2. 5.3.2 If the ground core has an insulating coating, it should comply with the XJ-00A regulations in GB7594.2. 5.3.3 The insulation shield adopts the Class A structure in Table 5 of GB12972.1. 5.4 Cable core 5.4.1 The position of the control wire core complies with the provisions of Article 7.2c of GB12972.1. 5.4.2 The position of the ground core complies with the requirements of GB12972.1 Article 7.4b. 5.4.3 The stranded pitch diameter ratio of the cable core should not be greater than 5. 5.5 Sheath 5.5.1 The sheath is a single-layer structure, and its performance complies with the XH-03A regulations in GB7594.7. 6 Test and inspection rules Products are tested according to Table 3 and Table 4. Table 3 Nominal cross-section of power wire core mm 2.5 4 Insulation resistance at 20℃||tt| |MO·km minimum value 160 160 maximum value 19.6 21.0 21.0 22.6| |tt||mm UZP-0.3/0.5 maximum value minimum value 19.4 20.8 20.9||tt ||22.4 20℃ conductor DC resistance a/km maximum value 8.83 5.39 22.2 23.6||tt ||23.8 25.5 Serial number 1 1.1Www.bzxZ.net 1.2 1.3 1.4 1.5 1.6 2 2.1 2.2 2.3 2.4 2.5 2.6| |tt||2.7 3 4 Project name Structural dimensions Conductor Insulation thickness Shielding Layer Cable core Sheath thickness Cable outer diameter Cable performance Conductor resistance Insulation resistance Transition resistance power frequency AC voltage test combustion test insulation physical machinery performance sheath physical machinery||tt ||Performance Identification mark Delivery length GB 12972.8-91 Table 4 Technical requirements Chapter 5.2 of this standard Article and Table 2 GB12972.1 Article 5.2 and this standard Table 2 This standard Article 5.3.3 GB12972.1 Article 7 and this standard GB12972 .1 Article 8 and Table 2 of this standard Table 2 of this standard Table 3 of this standard Table 3 of this standard Not more than 1kQ (not applicable to UZ -0.3/0.5) GB12972.1 Table 8 GB12972.1 Article 11.6 Article 5.3 of this standard Article 5.5 of this standard GB12972.1 Article 10 GB12972.1 Article 11.12 Note: St means periodic testing, which should be conducted at least once a year. Additional notes: This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Shanghai Cable Research Institute of the Ministry of Mechanical and Electronic Industry. Test type T,s T,s T,s T,s T,s T,s T,R T,R T,s T,R T,St T,St|| tt||T,St T,s R Test method GB4909.2 GB2951.2 Visual inspection Visual inspection of twist direction GB2951.3 GB2951.4 GB3048.4 GB3048.5 GB12972.1 Appendix D GB3048.8 GB12666.2 | | tt | Branch hospitals and other units are responsible for drafting. The main drafters of this standard are Liu Fenglin and Tang Kaizong. Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.